Which sentence uses correct parallel structure?

jake was elected student council president because he is a natural leader.

smoking is harmful to you, others around you, and is expensive.

penelope looked down the street, in her neighbor's yard, and in the woods behind her house, but she could not find her puppy anywhere.

the team was doing lay-ups, dribbling exercises, and they were also running laps in preparation for the game.

on our vacation we went swimming and hiking, but not the amusement park.

"On our vacation we went swimming and hiking, but not the amusement park" uses a correct parallel structure

Explanation:

Of the given sentences, the sentence “On our vacation we went swimming and hiking, but not the amusement park.” Primarily explains the parallel structure because the meaning of the sentence given is that the group of persons were performing swimming and hiking with equal importance but visiting the amusement park were not exactly their cup of tea.

This explains that the group gave more importance to swimming and hiking but not to visiting the amusement park. This explains the parallel structure of the sentence.

my best guess would be: d allusion

makes the most sense

c. there are many strengths